pycom-documentation/content/datasheets/boards/expansion3.md

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Expansion Board 3.0	datasheets/boards/expansion3.html datasheets/boards/expansion3.md product-info/boards/expansion3 chapter/datasheets/boards/expansion3

Datasheet

The datasheet of the Expansion Board is available as a PDF File.

Expansion Board Datasheet

Pinout

The pinout of the Expansion Board is available as a PDF File

Expansion Board 3 Pinout

{{% hint style="danger" %}} Be gentle when plugging/unplugging from the USB connector. Whilst the USB connector is soldered and is relatively strong, if it breaks off it can be very difficult to fix. {{< /hint >}}

Battery Charger

The Expansion Board features a single cell Li-Ion/Li-Po charger. When the board is being powered via the micro USB connector, the Expansion Board will charge the battery (if connected). When the CHG jumper is present the battery will be charged at 450mA. If this value is too high for your application, removing the jumper lowers the charge current to 100mA.

{{% hint style="info" %}} To use the battery, pull P8/G15 high (connect to 3v3). If you want to use the SD card as well, use a 10k pull-up. {{< /hint >}}

Differences between v2.0 and v3.0

• The FTDI chip as been replaced with a custom programmed PIC like on the

  Pysense/Pytrack/Pyscan boards. This allows our firmware update tool to

  automatically put the module into bootloader mode.

• Added a "Safe boot" button to enter safe boot easier. This button connects

  P12 to 3.3v and if pressed and held while the reset button is pressed on

  a Pycom module, the module will enter safe boot.

Troubleshooting

• If PIC stays in bootloader mode, the dfu-util update should be performed

3D model for case design

• Please see the 3D model (step format)